/*
 *  Licensed to the Apache Software Foundation (ASF) under one

 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 *
 */

package org.apache.directory.studio.persistence.view.wizards;


import org.apache.directory.studio.persistence.core.EntryProperties;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;


public class TableColumnSorter extends ViewerSorter
{
    private int propertyIndex;
    private static final int DESCENDING = 1;

    private int direction = DESCENDING;


    public TableColumnSorter()
    {
        this.propertyIndex = 0;
        direction = DESCENDING - 1;
    }


    public void setColumn( int column )
    {
        if ( column == this.propertyIndex )
        {
            // Same column as last sort; toggle the direction
            direction = 1 - direction;
        }
        else
        {
            // New column; do an ascending sort
            this.propertyIndex = column;
            direction = DESCENDING;
        }
    }


    @Override
    public int compare( Viewer viewer, Object e1, Object e2 )
    {
        EntryProperties ep1 = ( EntryProperties ) e1;
        EntryProperties ep2 = ( EntryProperties ) e2;
        int rc = 0;
        switch ( propertyIndex )
        {
            case 0:
                rc = ep1.getLdapAttributeName().compareTo( ep2.getLdapAttributeName() );
                break;

            case 1:
                rc = ep1.getJavaMemberName().compareTo( ep2.getJavaMemberName() );
                break;
            default:
                rc = 0;
        }
        // If descending order, flip the direction
        if ( direction == DESCENDING )
        {
            rc = -rc;
        }
        return rc;
    }
}
